US8125156B2 - Circuit arrangement for operating at least one high-pressure discharge lamp - Google Patents

Circuit arrangement for operating at least one high-pressure discharge lamp Download PDF

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Publication number
US8125156B2
US8125156B2 US10/888,022 US88802204A US8125156B2 US 8125156 B2 US8125156 B2 US 8125156B2 US 88802204 A US88802204 A US 88802204A US 8125156 B2 US8125156 B2 US 8125156B2
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United States
Prior art keywords
signal
circuit arrangement
frequency
switches
circuit
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Expired - Fee Related, expires
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US10/888,022
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English (en)
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US20050285544A1 (en
Inventor
Herbert Kaestle
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Osram GmbH
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Osram GmbH
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Assigned to OSRAM SYLVANIA INC. reassignment OSRAM SYLVANIA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAESTLE, HERBERT
Publication of US20050285544A1 publication Critical patent/US20050285544A1/en
Assigned to PATENT-TREUHAND-GESELLSCHAFT FUER ELEKTRISCHE GLUEHLAMPEN MBH reassignment PATENT-TREUHAND-GESELLSCHAFT FUER ELEKTRISCHE GLUEHLAMPEN MBH CORRECTIVE ASSIGNMENT TO CORRECT THE RERECORD TO CORRECT ASSIGNEE PREVIOUSLY RECORDED ON REEL 016501 FRAME 0676. ASSIGNOR(S) HEREBY CONFIRMS THE ASSIGNMENT. Assignors: KAESTLE, HERBERT
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/2885—Static converters especially adapted therefor; Control thereof
    • H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters
    • H05B41/288—Circuit arrangements in which the lamp is fed by power derived from DC by means of a converter, e.g. by high-voltage DC using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
    • H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
    • H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3927—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation
    • H05B41/3928—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by pulse width modulation for high-pressure lamps, e.g. high-intensity discharge lamps, high-pressure mercury or sodium lamps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S315/00—Electric lamp and discharge devices: systems
    • Y10S315/02—High frequency starting operation for fluorescent lamp

Definitions

  • the present invention relates to a circuit arrangement for operating at least one high-pressure discharge lamp, having four switches in a full-bridge arrangement, a first and a second switch forming the first half-bridge arm, and a third and a fourth switch forming the second half-bridge arm, at least two terminals for coupling the high-pressure discharge lamp between the midpoint of the first and the second half-bridge arms, at least two terminals for supplying the circuit arrangement with a dc voltage signal and a drive circuit for driving the four switches.
  • the circuit arrangement 10 shown in FIG. 1 firstly comprises a preconditioner 12 that serves the purpose of power factor correction, in particular. Following thereupon is a full-bridge arrangement 14 with four switches. This serves as a commutator and changes the polarity of the voltage signal that is fed to the lamp 16 via the filter circuit 18 .
  • a drive circuit 20 that is fed the lamp current I L and the lamp voltage U L as input signal provides as output signal drive signals z(t) that are fed to driver circuits 22 for the switches of the full bridge 14 .
  • the drive circuit ( 20 ) comprises in general a power control element that operates a signal generator for controlling a PWM (Pulse Width Modulation) module. It can be implemented both in analog fashion and digitally with the aid of a microprocessor.
  • PWM Pulse Width Modulation
  • a microprocessor 24 arranged within the drive circuit 20 is a microprocessor 24 , a signal generator 26 and a PWM module 28 .
  • the frequency f a of the amplitude modulation is in a range of between 20 and 30 kHz, while the carrier frequency f t is typically swept between 45 and 55 kHz.
  • the PWM module 28 must be fed a very complex signal via the signal x(t), in particular the complete signature of the desired signal.
  • the signal y(t) fed via the system input of the PWM module 28 is a function of a constant system frequency f 0 (corresponding to a period of T 0 ) that is at 500 kHz in accordance with the prior art: see FIG. 5 of WO 02/30162 in this regard, for example.
  • the entire full bridge and drive circuit 14 , 20 must be designed for high switching frequencies. This results, on the one hand, in high costs for the required components, and secondly in high switching losses. On the other hand, high demands are placed on the signal generator 26 , which must provide the complete signal signature for the PWM module 28 (comparable to the classic class D principle).
  • the voltage signal x(t) provided to the PWM module 28 is a low-voltage version of the waveform that is desired for driving the lamp 16 . In other words, the entire information is present in the signal x(t).
  • the present invention is based on the finding that a particularly favorable implementation can be achieved when a comparator, for example in the form of a PWM module, is, on the one hand provided merely with an amplitude modulation signal as signal x(t), that is to say at the modulation input, while the swept carrier frequency signal is supplied as signal y(t) at the system input.
  • the object can be achieved in a corresponding way when the phase is modulated in a suitable way instead of the pulse width.
  • the modulation depth at the ac voltage output toward the lamp can be set via the depth of the pulse width modulation or the depth of the phase shift. Consequently, in the case of preferred embodiments the sampling operations are of an order of magnitude of approximately 50 kHz, thus opening up implementations that save power and are cost effective.
  • the analog amplitude modulation signal x(t) is generated from a digital square wave signal per filtering at an LC element.
  • the frequency of this signal is preferably below 50 kHz, preferably between 20 and 35 kHz.
  • the clock frequency of the signal y(t) is preferably below 150 kHz, preferably between 40 and 60 kHz or between 80 and 120 kHz, depending on the design of the lamp to be operated thereby, in particular with regard to its sweep frequency range.
  • the sweep frequency is preferably between 50 Hz and 500 Hz, preferably between 80 Hz and 200 Hz.
  • the drive circuit is preferably designed such that in each case the switches in the diagonal arms of the full bridge arrangement are driven with the aid of the same signal.
  • the drive circuit comprises a phase shift module whose clock input is coupled to a source for the clock pulse swept between the first and second frequencies, and whose modulation input is coupled to a source for the signal at the third frequency (f a ).
  • the pulse width can be modulated asymmetrically or symmetrically.
  • the drive circuit preferably comprises a PWM module whose clock input is coupled to a source for the signal swept between the first and the second frequencies, and whose modulation input is coupled to a source for the signal at the third frequency.
  • the modulation input of the PWM module is preferably coupled to a source for an offset signal, it thereby being possible to control the basic power at the full bridge output. It is thereby possible to intervene simultaneously in order to regulate the lamp power.
  • FIG. 1 shows a block diagram of an embodiment of a circuit arrangement according to the invention
  • FIG. 2 a shows a drive, known from the prior art, of the PWM module in accordance with FIG. 1 ;
  • FIG. 2 b shows an inventive drive of the PWM module in accordance with FIG. 1 ;
  • FIG. 3 shows a block diagram of a further embodiment of a circuit arrangement according to the invention.
  • FIG. 4 shows a schematic of the generation of a symmetrical output signal of the PWM module
  • FIG. 5 shows a schematic of the generation of an asymmetric output signal of the PWM module
  • FIG. 6 shows a schematic of the generation of a dual alternating output signal of the PWM module in the case of symmetrical implementation
  • FIG. 7 shows a schematic of the generation of a dual alternating output signal of the PWM module in the case of asymmetric implementation
  • FIG. 8 shows a schematic of the generation of a phase shift in the output signal of the PWM module
  • FIG. 9 shows a schematic of a comparison of dual alternating complementary signals in the case of pulse width modulation.
  • FIG. 10 shows a schematic of a comparison of dual alternating complementary signals in the case of phase modulation.
  • FIG. 2 b shows the inventive driving of the PWM module 28 of FIG. 1 .
  • a PWM module that is driven at its clock input with the aid of a square wave signal from which it generates a saw-tooth signal
  • the same function can also be realized by a circuit having a comparator.
  • a PWM module can be considered as a comparator that receives a saw tooth signal at a clock input and receives at its modulation input the modulation signal that is converted into a pulse width signal.
  • the signal present at the clock input that is to say a square wave signal at the clock input of a PWM module or a saw tooth signal at the clock input of a comparator is denoted below in general by y(t).
  • a saw-tooth signal whose frequency is equal to the swept clock frequency f t is now applied to the clock input.
  • a signal z(t) that has a period of T t and whose rear edge is displaced with the frequency f a .
  • the modulation depth can be set with the aid of the parameter ⁇ .
  • FIG. 3 shows a further exemplary embodiment of an inventive circuit arrangement, components and modules comparable to those in FIG. 1 being denoted by identical reference symbols and not being explained again.
  • Initiated in the microprocessor 24 is the generation of a square wave signal with the frequency that is to be used to undertake the amplitude modulation or the phase shift.
  • a square wave signal is generated for this purpose in a square wave generator that, in order to fashion therefrom a sinusoidal signal, is routed via an LC filter 32 .
  • This sinusoidal signal is modified in a damping element 34 in accordance with a modulation index prescribed in the device 36 .
  • An offset signal OS can be defined via a unit 38 , and serves for setting the lamp power.
  • the offset signal OS and the amplitude modulation signal AM are fed to an adder 40 that generates therefrom the signal x(t) that is coupled to the modulation input of the PWM module 28 .
  • a swept clock signal y(t) is generated in the block 42 and coupled to the clock input of the PWM module 28 .
  • the PWM module 28 generates at its output a signal z(t) or a pair of dual alternating signals z 1 (t) and z 2 (t). If the PWM module is replaced by a phase shift module, it generates a signal pair modulated with regard to its phase angle. Yet further details will be given on this aspect with reference to FIGS. 4 to 10 .
  • the signals z 1 (t) and z 2 (t) constitute dual alternating PWM signals. They differ from one another in their phase, shifted by 180°, and serve for driving the driving circuits 22 a for the switches Q 3 and Q 4 , and the driver circuit 22 b for the switches Q 1 and Q 2 of the full bridge 14 that is connected between a dc voltage supply (400 VDC) and ground (Gnd).
  • the driver circuits 22 a , 22 b provide signals z 1 (t) and z 2 (t), z 1 (t) being complementary to z 1 (t), and z 2 (t) being complementary to z 2 (t).
  • FIGS. 4 and 5 show schematics of the generation of a symmetrical ( FIG. 4 ) and an asymmetric ( FIG. 5 ) PWM module output signal.
  • the respective curve trace a) designates the base oscillator signal, here a square wave signal at frequency f t , which is swept, for example, at a sweep frequency f s of 100 Hz between 45 and 55 kHz.
  • the respective curve trace x(t) designates the amplitude-modulated output signal of the generator 26 .
  • x(t) is, for example, a sinusoidal signal of amplitude ⁇ current and a frequency of 24.5 kHz.
  • An asymmetric comparator ramp signal is generated from the base oscillator signal in FIG. 5 .
  • FIGS. 6 and 7 show the generation of dual pairs of drive signals z 1 (t) and z 2 (t), again once with a symmetrical PWM module output signal ( FIG. 6 ) and with an asymmetric PWM module output signal ( FIG. 7 ).
  • means familiar to the person skilled in the art are used to derive from the same base oscillator signal that was used in FIGS. 4 and 5 a comparator ramp signal y(t) of double the base oscillator frequency.
  • the respective amplitude modulation signal x(t) present at the modulation input is the same as in FIGS. 4 and 5 . Consequently, dual pairs z 1 (t) and z 2 (t) of output signals of the PWM module 28 (not shown in FIG.
  • no square wave signals with frequencies higher than f t thus not higher than 55 kHz in the present case, occur at the outputs of the PWM module 28 .
  • FIG. 8 shows a schematic of the generation of a PWM module output signal with phase shift, using a phase shift module (not illustrated) instead of a PWM module.
  • the base oscillator signal illustrated as curve trace a) forms the signal z 1 (t) and the delayed signal, illustrated as curve trace (c), whose delay value ⁇ i is inversely proportional to the PWM modulation signal x(t).
  • a PWM modulation signal of high amplitude therefore leads to a short delay, and a PWM modulation signal x(t) of small amplitude to a long delay.
  • the vertical arrows illustrated in FIG. 8 at the curve trace b) correspond to the delays ⁇ 1 , ⁇ 2 etc. between z 1 (t) and z 2 (t) as illustrated in FIG. 8 c.
  • the active PWM window is illustrated in FIG. 8 d as the result of driving the individual switches which contain the entire information relating to the swept clock frequency and the amplitude modulation signal.
  • the switches of the full bridge are driven as follows with reference to FIG. 8 : Q 1 with z 1 (t), Q 2 with z 1 (t), Q 3 with z 2 (t) and Q 4 with z 2 (t).
  • FIG. 9 shows once again, for the case of pulse width modulation, the time characteristic of the clock signal y(t) at the frequency f t , as well as the signals z 1 (t), z 1 (t), z 2 (t) and z 2 (t).
  • the time ⁇ in which the respective switches are switched on is varied with the frequency fa.
  • FIG. 10 shows once again, for the case of phase modulation, the time characteristic of the clock signal y(t) at the frequency f 1 , as well as the signals z 1 (t), z 1 (t), z 2 (t) and z 2 (t).
  • the signal characteristics d 1 ) and d 2 ) show the effective superimposition of the signals at the switches Q 1 Q 4 and Q 2 Q 3 respectively.
  • the delay ⁇ with which z1(t) follows z2(t) is varied with the frequency fa.

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  • Circuit Arrangements For Discharge Lamps (AREA)
  • Inverter Devices (AREA)
US10/888,022 2003-07-24 2004-07-12 Circuit arrangement for operating at least one high-pressure discharge lamp Expired - Fee Related US8125156B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10333820.9 2003-07-24
DE10333820A DE10333820A1 (de) 2003-07-24 2003-07-24 Schaltungsanordnung zum Betreiben mindestens einer Hochdruckentladungslampe
DE10333820 2003-07-24

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US20050285544A1 US20050285544A1 (en) 2005-12-29
US8125156B2 true US8125156B2 (en) 2012-02-28

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US (1) US8125156B2 (de)
EP (1) EP1501338A3 (de)
JP (1) JP4638698B2 (de)
KR (1) KR20050012150A (de)
CN (1) CN1578579A (de)
CA (1) CA2475400A1 (de)
DE (1) DE10333820A1 (de)
TW (1) TWI270324B (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004042996A1 (de) * 2004-09-06 2006-03-09 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung zum Betreiben mindestens einer Hochdruckentladungslampe
DE102005059762A1 (de) * 2005-12-14 2007-06-21 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Schaltungsanordnung und Verfahren zum Betreiben von Hochdruck-Gasentladungslampen
KR101073302B1 (ko) 2007-01-10 2011-10-12 오스람 아게 고압 방전 램프를 동작시키기 위한 회로 어레인지먼트 및 방법
DE102009016579A1 (de) * 2009-04-06 2010-10-14 Osram Gesellschaft mit beschränkter Haftung Schaltungsanordnung und Verfahren zum Betreiben einer Hochdruckentladungslampe
JP5053395B2 (ja) 2010-01-29 2012-10-17 Ｔｄｋラムダ株式会社 放電灯点灯装置
WO2013038322A1 (en) * 2011-09-14 2013-03-21 Koninklijke Philips Electronics N.V. Digitally controlled electronic ballast with anti-striation control and method of operation thereof
DE102019127709B4 (de) * 2019-10-15 2023-05-04 Webasto SE Verfahren und Vorrichtung zur PWM-Ansteuerung von HV-Komponenten

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Publication number Priority date Publication date Assignee Title
US4904907A (en) * 1988-02-26 1990-02-27 General Electric Company Ballast circuit for metal halide lamp
WO1997022232A1 (en) 1995-12-08 1997-06-19 Philips Electronics N.V. Ballast system
US5923129A (en) * 1997-03-14 1999-07-13 Linfinity Microelectronics Apparatus and method for starting a fluorescent lamp
JPH11297482A (ja) 1998-04-06 1999-10-29 Meiji Natl Ind Co Ltd 交流高圧放電灯点灯装置
WO2000079841A1 (en) 1999-06-17 2000-12-28 Koninklijke Philips Electronics N.V. Reduction of vertical segregation in a discharge lamp
WO2002009480A1 (en) 2000-07-20 2002-01-31 Koninklijke Philips Electronics N.V. A system and method for determining the frequency of longitudinal mode required for color mixing in a discharge lamp
WO2002030162A2 (en) 2000-10-06 2002-04-11 Koninklijke Philips Electronics N.V. A system and method for employing pulse width modulation for reducing vertical segregation in a gas discharge lamp
US20020041165A1 (en) 2000-10-06 2002-04-11 Koninklijke Philips Electronics N.V System and method for employing pulse width modulation with a bridge frequency sweep to implement color mixing lamp drive scheme
US20020047644A1 (en) 2000-02-10 2002-04-25 Masayasu Ito Discharge lamp lighting circuit
US6483259B1 (en) 2001-06-12 2002-11-19 Koninklijke Phillips Electronics N.V. Method and apparatus for determining power frequencies that cause arc instabilities in discharge lamps
US20030117086A1 (en) 2001-12-21 2003-06-26 Koninklijke Philips Electronics N.V. Use of arc straightening in HID lamps operated at VHF frequencies

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Publication number Priority date Publication date Assignee Title
US4904907A (en) * 1988-02-26 1990-02-27 General Electric Company Ballast circuit for metal halide lamp
WO1997022232A1 (en) 1995-12-08 1997-06-19 Philips Electronics N.V. Ballast system
US5923129A (en) * 1997-03-14 1999-07-13 Linfinity Microelectronics Apparatus and method for starting a fluorescent lamp
JPH11297482A (ja) 1998-04-06 1999-10-29 Meiji Natl Ind Co Ltd 交流高圧放電灯点灯装置
WO2000079841A1 (en) 1999-06-17 2000-12-28 Koninklijke Philips Electronics N.V. Reduction of vertical segregation in a discharge lamp
EP1434471A1 (de) 1999-06-17 2004-06-30 Koninklijke Philips Electronics N.V. Reduktion von Vertikalfarbtrennung in Entladungslampen
US20020047644A1 (en) 2000-02-10 2002-04-25 Masayasu Ito Discharge lamp lighting circuit
WO2002009480A1 (en) 2000-07-20 2002-01-31 Koninklijke Philips Electronics N.V. A system and method for determining the frequency of longitudinal mode required for color mixing in a discharge lamp
WO2002030162A2 (en) 2000-10-06 2002-04-11 Koninklijke Philips Electronics N.V. A system and method for employing pulse width modulation for reducing vertical segregation in a gas discharge lamp
US20020041165A1 (en) 2000-10-06 2002-04-11 Koninklijke Philips Electronics N.V System and method for employing pulse width modulation with a bridge frequency sweep to implement color mixing lamp drive scheme
US6483259B1 (en) 2001-06-12 2002-11-19 Koninklijke Phillips Electronics N.V. Method and apparatus for determining power frequencies that cause arc instabilities in discharge lamps
WO2003024161A1 (en) 2001-07-30 2003-03-20 Koninklijke Philips Electronics N.V. Reducing color segregation in hid lamps
US20030117086A1 (en) 2001-12-21 2003-06-26 Koninklijke Philips Electronics N.V. Use of arc straightening in HID lamps operated at VHF frequencies

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Title
English language abstract for JP 11297482 A, Oct. 29, 1999.
European Search Report of EP Application No. 04015908 mailed Feb. 4, 2009.

Also Published As

Publication number Publication date
TWI270324B (en) 2007-01-01
JP2005044812A (ja) 2005-02-17
EP1501338A2 (de) 2005-01-26
DE10333820A1 (de) 2005-02-17
US20050285544A1 (en) 2005-12-29
CN1578579A (zh) 2005-02-09
CA2475400A1 (en) 2005-01-24
JP4638698B2 (ja) 2011-02-23
TW200520630A (en) 2005-06-16
KR20050012150A (ko) 2005-01-31
EP1501338A3 (de) 2009-03-04

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